<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
function to_excel($query, $filename='exceloutput'){
$headers = '';
$data = '';
$obj =get_instance();
$fields = $query->field_data();
if ($query->num_rows() == 0) {
echo '<p>The table appears to have no data.</p>';
} else {
foreach ($fields as $field) {
$headers .= $field->name . "\t";
}

foreach ($query->result() as $row) {
$line = '';
foreach($row as $value) {
if ((!isset($value)) OR ($value == "")) {
$value = "\t";
} else {
$value = str_replace('"', '""', $value);
$value = '"' . $value . '"' . "\t";
}
$line .= $value;
}
$data .= trim($line)."\r\n";
}
$data = str_replace("\r","",$data);

header("Content-type: application/x-msdownload");
header("Content-Disposition: attachment; filename=$filename.xls");
echo "$headers\n$data";
}
}